STU-GTIIT光学论坛（No.36）
报告地点：at lecture hall E310 in the north campus of GTIIT
报告时间：2024年12月31日 16:00
报告题目: Artificial room-temperature quantum states(全英)
报 告 人：Xue-Hua Wang(State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China)
报告摘要:
Room-temperature (RT) quantum state is the key foundation for the development of high-performance micro-nano quantum optoelectronic devices, quantum computation and solid-state quantum chips. However, it is extremely difficult for the quantum states to survive at the RT due to the huge dissipation. The potential solution is to constructing artificial RT quantum states by strong coupling between emitters and photons. Over the past more than two decades, the only method of achieving the RT strong coupling quantum state is to greatly improve the exciton-photon coupling strength for overcoming the huge dissipation. The plasmonic microcavities has been applied for this purpose1-3. I will firstly introduce the critical criteria and diversity of the RT strong coupling4,5. Then, I will present how to realize the RT single qubit formed by the strong coupling of a single exciton with a single metal nanoparticle6. However, the RT strong coupling achieved by enhancing the coupling strength is accidental events with very low probability of less than 1% due to harsh critical conditions. To overcome this challenge, we present a highly-efficient approach for achieving the room-temperature strong coupling by reducing the critical coupling strength at the exceptional point based upon the damping inhibition and matching of the coupled systems7. In contrast to the method of enhancing the exciton-photon coupling strength, our strategy can dramatically relax the harsh critical conditions and significantly improves the experimental success rate of the RT strong coupling from about 1% to 80%, which will boost advance in the RT strong coupling quantum states and the quantum devices.
[1] J. J. Baumberg et al., Nature 535, 127 (2016).
[2] G. Haran et al., Nature Commun.7, 11823 (2016).
[3] R. M. Liu et al., Phys. Rev. Lett. 118, 237401 (2017).
[4] R. M. Liu et al., Phys. Rev. B 103, 235430 (2021).
[5] J. Zhong et al., Nano Lett. 24, 1579 (2024).
[6] J. Y. Li et al., Nano Lett. 22, 4686 (2022).
[7] W. Li et al., Phys. Rev. Lett. 130, 143601 (2023).
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理学院
2024年12月25日
